But when I got it, it had MOTORAD stamped on it.
Anybody ever heard of this before? I always thought Motorad was a third rate option so I thouht I got ripped off.
I contacted ACDELCO via facebook and after a couple of weeks they replied with:

"Hi, Todd. Our internal resource informed me that Motorad is contracted with ACDelco to manufacture parts to ACDelco specifications. If you have any other questions, you can always ask us here. " -Rhea J.So apparently, there are two ACDELCO thermostats that fit! But I, and you, need to buy the 131-158 version. Because only one is made to GM specs, the other (12T103D) is made to specs pulled from someone's rear. Why even do that? Why attach your brand to that?

I ASSUME that Motorad has nothing to do with the 131-158 thermostat, but I could be wrong. Anybody?